From the master craftsmen at Seiko, the Seiko Men's SNK807 Seiko 5 Automatic Blue Canvas Strap Watch is a cutting-edge timepiece with a masculine appeal. Featuring a blue analog dial and a blue canvas band, this watch is packed with style and would be a great addition to your watch collection.This is an automatic mechanical watch. Automatic watches do not operate on batteries; instead, they are powered automatically by the movement of the wearer’s arm. If the main spring in your automatic watch is not wound sufficiently, timekeeping may become less accurate. In order to maintain accuracy, wear the watch for 8 hours or more per day, or manually wind the main spring by turning the crown. When not in use, automatic watches may be kept charged with an automatic watch winder – a watch storage unit which may be purchased separately.